UNI Rewards are from the incentive campaign launched by Gauntlet as part of a recent UNI governance proposal. Providing liquidity to v4 pools on the Uniswap Protocol can earn UNI Rewards. You can see the details here.
UNI Rewards are separate from the fees that Liquidity Providers collect. To claim regular fees from a v4 pool, see our article here.
Uniswap Labs displays data related to pools that are earning UNI Rewards, but UNI Rewards are not processed by Uniswap Labs. UNI Rewards are distributed by the autonomous Merkl Distributor contract (Merkl). If you have any trouble claiming rewards, visit the Merkl Help Center.
To see your liquidity positions that are earning rewards, go to https://app.uniswap.org/positions. You can claim any earned rewards by selecting “Collect Rewards” in the upper right.
You can also claim rewards by connecting your wallet to the Merkl dashboard.